A nurse is teaching a client who is pregnant and has iron-deficiency anemia about taking ferrous sulfate elixir. Which of the following instructions should the nurse include in the teaching? (Select all that apply.)

A. "Drink the elixir using a straw to prevent staining your teeth.": Using a straw helps prevent the liquid iron from coming into direct contact with the teeth, reducing the risk of permanent staining, which is a common side effect of ferrous sulfate elixir. B. "Take the medication with an antacid if it upsets your stomach.": Antacids decrease the absorption of iron. To optimize effectiveness, ferrous sulfate should be taken on an empty stomach or with vitamin C–rich foods, rather than with antacids. C. "Increase your fiber intake to prevent constipation.": Iron supplements commonly cause constipation. Increasing dietary fiber, fluids, and physical activity can help manage this adverse effect and maintain regular bowel function. D. "Stop taking the medication if your stools become green or black.": Dark stools are a common, harmless side effect of iron supplementation. Clients should be reassured rather than stopping the medication. E. "Increase your intake of dairy products to increase the absorption of this medication.": Dairy products contain calcium, which inhibits iron absorption. Iron should be taken separately from calcium-rich foods or supplements to maximize absorption.